Diego Garcia Island, Indian Ocean
The Diego Garcia Island is in the Indian Ocean but is also part of the United Kingdom. However, in 1966, the United States secured the rights to the island, and it’s now a United States military visit with 654 buildings and approximately military personnel. In 2009, the military evicted thousands of the island’s inhabitants and it’s unknown what goes on in there, but rumor has it that it’s a secret military prison.